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SITE AND FACILITY ACCEPTANCE TESTING CHAPTER 2: SITE DESIGN AND DEVELOPMENT 2.11 SITE AND FACILITY ACCEPTANCE TESTING When site development, including tower construction, antenna and transmission line installation, utility connection, building or shelter placement or construction, and roadway construction, is complete, all applicable areas of the site shall be inspected and tested, to ensure that all installations and alarms are functioning properly before the site is presented for customer acceptance. All aspects of the inspection and testing shall be documented. Items to inspect and test may include but are not limited to the following: • Site AC power and alarms • Transfer switch functionality and alarms • HVAC equipment and alarms (including high and low temperature and high humidity) • Generator functionality and alarms • Fire or smoke detection devices • UPS functionality and alarms • Tower lighting functionality and alarms • Dehydrator functionality and alarm • Security measures such as door alarms and deadbolts • Antenna and transmission line installations • Concrete compressive strength requirements • All aspects of the site, building and tower drawings are met or properly as-built • General workmanship • Site and building are clean and free of trash and debris • Tower installation is in accordance with the latest version of ANSI/EIA/TIA-222 (or other applicable local Standards body design requirements) • R56 audit 2.12 TOWER DESIGN AND CONSTRUCTION When designing a tower site with a related equipment shelter, it is recommended that the tower be placed a minimum of 9.1 m (30 ft.) from the shelter when possible. This distance provides a balance between line loss in the antenna transmission line and the reduction in the amount of electromagnetic energy (EME) induced into the shelter in the event of a tower lightning strike. The separation will also help increase the ability of the tower grounding electrode system to dissipate the lightning energy before it reaches the shelter. It is recommended that the distance between the tower and the shelter be no less than 3 m (10 ft.) to help prevent ice damage to the building, and EME effects. NOTE: Increasing the distance between the tower and shelter from 3 m to 9.1 m (10 ft. to 30 ft.) reduces the amount of EME induced into the building by a factor of 9 (EME reduction factor = distance factor 2 ). For example, increasing the distance by a factor of 3 (from 10 ft. to 30 ft.) results in an EME reduction factor of 3 2 , or 9. 2-16 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES TOWER DESIGN AND CONSTRUCTION NOTE: Twist and sway of a tower affects the performance of microwave links. Therefore it is imperative that the proper loading information for each tower shall be supplied to the tower designer to help ensure that the tower meets ANSI/EIA/TIA-222 (or other applicable local Standards body) requirements. All tower and tower loading design shall be performed by a registered professional structural engineer. If a structure other than a tower will be used to support a communication system antenna, the tower designer and/or a registered professional engineer specializing in tower structure design shall be contracted to analyze whether the structure can safely support the proposed load. Tower mapping may also be required. Tower height is determined by a number of factors, including but not limited to the following: • Required RF coverage • Location • Seismic risk probability • Available area • Existing structures in the vicinity • Terrain • Required antenna height • Federal Aviation Authority (FAA) or jurisdictional approval • Future tower capacity Unless otherwise specified, all towers and foundations shall be designed to the latest version of ANSI/ EIA-TIA 222 unless jurisdictional laws or codes mandate otherwise. The following tower design requirements apply: • A minimum of one safety climb shall be engineered, supplied and installed on every tower. • EME precautions shall be as described in Appendix A. • Rest platforms shall be designed and installed per OSHA or other applicable Occupational Safety and Health standards, or as recommended by the tower manufacturer. If additional antennas are to be added to an existing tower, or if a structure other than a tower will be used to support a communication system antenna, the original tower vendor and/or a registered professional structural engineer shall be contracted to analyze whether the tower or structure can safely support the additional load. Tower mapping may also be required. Table 2-2 provides a brief comparison of the three most common tower types. 68P81089E50-B 9/1/05 2-17
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Page 3 and 4: TABLE OF CONTENTS Chapter 1. Introd
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STANDARDS AND GUIDELINES FOR COMMUN
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CHAPTER 5 INTERNAL GROUNDING (EARTH
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CHAPTER 6 POWER SOURCES 6 6.1 LOCKO
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CHAPTER 7 SURGE PROTECTIVE DEVICES
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CHAPTER 8 MINIMIZING SITE INTERFERE
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CHAPTER 9 EQUIPMENT INSTALLATION 9
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APPENDIX A ELECTROMAGNETIC ENERGY I
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APPENDIX B SOIL RESISTIVITY MEASURE
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APPENDIX C PROTECTING AGAINST ELECT
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APPENDIX D GROUNDING (EARTHING) ELE
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APPENDIX E GENERAL CONVERSIONS AND
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APPENDIX F R56 COMPLIANCE CHECKLIST
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I NDEX Index Index AC power cabling
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